15. There’s Only One Earth, so We Can’t Do a Controlled Experiment – and the Future Hasn’t Happened Yet So Detection, Attribution, and Prediction All Depend on Models
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25. This will Change U.S. Geography – Although No one Is Sure Exactly How
34. Another Outside but Scary Possibility: Changes in the Thermohaline Circulation that Warms Europe
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36. It’s Also Possible but Unlikely that the Impact of Global Warming will be Minor or Even Beneficial. Would You Like to Take this Risk? Or Would You Prefer to Take Precautions?
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46. US Senate (1998) Refuses (95-0) to Ratify Kyoto Protocol Unless LDCs Agree to Conservation Targets. Newly Installed Bush Administration Abandons Kyoto Protocol on the Grounds of Damage to Economy ‘ Inadequate Science.’ Little Net Reduction in Emissions Refusal to Try to Improve Kyoto Furiously Resented by Europeans
FAQ 2.1, Figure 2. Summary of the principal components of the radiative forcing of climate change. All these radiative forcings result from one or more factors that affect climate and are associated with human activities or natural processes as discussed in the text. The values represent the forcings in 2005 relative to the start of the industrial era (about 1750). Human activities cause significant changes in long-lived gases, ozone, water vapor, surface albedo, aerosols and contrails. The only increase in natural forcing of any significance between 1750 and 2005 occurred in solar irradiance. Positive forcings lead to warming of climate and negative forcings lead to a cooling. The thin black line attached to each colored bar represents the range of uncertainty for the respective value. (Figure adapted from Figure 2.20 of this report.)
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